東華大學圖書館 |

Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution./
作者:	White-Pettigrew, Matthew.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
面頁冊數:	158 p.
附註:	Source: Masters Abstracts International, Volume: 85-09.
Contained By:	Masters Abstracts International85-09.
標題:	Nitrates. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30846361
ISBN:	9798381855456

Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution.
White-Pettigrew, Matthew.

Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 158 p.

Source: Masters Abstracts International, Volume: 85-09.

Thesis (M.Phil.)--The University of Manchester (United Kingdom), 2024.

Radionuclide-polluted groundwater is present at numerous nuclear facilities across the world. Aside from the environmental problems associated with their migration, the practical and financial impacts surrounding conventional radionuclide remediation methods present further issues. Laboratory experiments encompassing pure culture, sediment microcosm and flowthrough column studies have shown that indigenous sediment bacteria can remove radionuclides including uranium and strontium from contaminated groundwater. For example the biostimulation of anaerobic bacteria with various organic electron donors has been shown to reduce soluble U(VI) to sparingly-soluble U(IV) biominerals. This enzymatic-mechanism of precipitating high oxidation state radionuclide contaminants as their reduced valence forms extends to other fission products (e.g. Tc(VII) to Tc(IV), and Np(V) to Np(IV)) and has been considered for prospective in-situ biotechnological remediation strategies. Enhancing the recalcitrance of reduced uranium (U(IV)) (bio)minerals is the subject of a significant body of academic research, given their susceptibility to oxidative dissolution. Strontium is a redox inactive element, lending to its contrasting biogeochemical cycling in the environment. In the environment, strontiuma€™s solubility is most strongly mediated by the soil constituents possessing highly-reactive surfaces. These include silicate clay minerals and iron oxides, whose surfaces are prone to sorbing dissolved ionic species depending on their pH-dependant surface charge. Sorbed Sr2+cations remain susceptible to being released back into solution via ion exchange with other divalent cations at mineral surfaces. Precipitating strontium biominerals through microbially generated ligands, such as carbonate and phosphate, is a wellstudied method for enhancing strontium removal.In this study, the susceptibility of various (a)biotically-derived uranium and strontium (bio)remediation endpoints to oxidative dissolution was assessed using sediment microcosms. After the simultaneous removal of U and Sr using a range of biotic and abiotic treatment methods, namely organic electron donors and functionalised nanoparticles respectively, separate reoxidation batch microcosm experiments were set up to investigate how recalcitrant these phases were to oxidising conditions, induced either aerobically or through the addition of nitrate. Of the 6 experimental microcosms, 3 treatment methods resulted in the enhanced cotreatment of U and Sr, compared with a control microcosm not amended with any treatment. The compounds that enhanced uranium and strontium removal were Carbo-iron, Nanofer25S and glycerol phosphate. Glycerol phosphate additions concurrently precipitated amorphous U(IV)-phosphate and strontium-incorporated calcium phosphate biominerals. The strontiumphosphate biominerals proved highly recalcitrant to oxidative dissolution, with the (a)biotically induced oxidising conditions further enhanced strontium removal as opposed to releasing strontium back into solution. The microcosms amended with Carbo-iron produced a carbon and iron-associated U(IV) species, by far the least susceptible to remobilisation under aerobic conditions, and also one of the most recalcitrant to nitrate-induced oxidation (along with glycerol phosphate and Nanofer25S treatments). Transferring the end-product of glycerol phosphate treatment (U(IV)-phosphate) to aerobic conditions resulted in a steady increase in dissolved uranium concentration, although the endpoint was highly resistant to nitrate-induced oxidation. Lastly, the potential of urea to stimulate bacterial ureolysis in an indigenous microbial community was examined, again using Sellafield-sediment microcosms. It was hypothesised that the ureolytic activity would generate sufficient alkalinity, favouring calcium carbonate precipitation, capable of coprecipitating aqueous Sr2+ions. However, attempts to induce strontium-incorporated calcium carbona.

ISBN: 9798381855456Subjects--Topical Terms:

914879
Nitrates.

Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution.
LDR:05383nmm a2200445 4500 001 2403435
005 20241118085735.5
006 m o d
007 cr#unu||||||||
008 251215s2024 ||||||||||||||||| ||eng d
020 $a 9798381855456
035 $a (MiAaPQ)AAI30846361
035 $a (MiAaPQ)Manchester_UK6a48a30b-a434-4014-8cb5-05da3a51651f
035 $a AAI30846361
040 $a MiAaPQ $c MiAaPQ
100 1 $a White-Pettigrew, Matthew. $3 3773708
245 1 0 $a Comparing the Efficiency of Various Microbial and Nanoparticulate Treatments Aimed at Remediating Uranium and Strontium, with an Emphasis on Endpoint Identification and Recalcitrance to Oxidative Dissolution.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 158 p.
500 $a Source: Masters Abstracts International, Volume: 85-09.
500 $a Advisor: Lloyd, Jonathan.
502 $a Thesis (M.Phil.)--The University of Manchester (United Kingdom), 2024.
520 $a Radionuclide-polluted groundwater is present at numerous nuclear facilities across the world. Aside from the environmental problems associated with their migration, the practical and financial impacts surrounding conventional radionuclide remediation methods present further issues. Laboratory experiments encompassing pure culture, sediment microcosm and flowthrough column studies have shown that indigenous sediment bacteria can remove radionuclides including uranium and strontium from contaminated groundwater. For example the biostimulation of anaerobic bacteria with various organic electron donors has been shown to reduce soluble U(VI) to sparingly-soluble U(IV) biominerals. This enzymatic-mechanism of precipitating high oxidation state radionuclide contaminants as their reduced valence forms extends to other fission products (e.g. Tc(VII) to Tc(IV), and Np(V) to Np(IV)) and has been considered for prospective in-situ biotechnological remediation strategies. Enhancing the recalcitrance of reduced uranium (U(IV)) (bio)minerals is the subject of a significant body of academic research, given their susceptibility to oxidative dissolution. Strontium is a redox inactive element, lending to its contrasting biogeochemical cycling in the environment. In the environment, strontiuma€™s solubility is most strongly mediated by the soil constituents possessing highly-reactive surfaces. These include silicate clay minerals and iron oxides, whose surfaces are prone to sorbing dissolved ionic species depending on their pH-dependant surface charge. Sorbed Sr2+cations remain susceptible to being released back into solution via ion exchange with other divalent cations at mineral surfaces. Precipitating strontium biominerals through microbially generated ligands, such as carbonate and phosphate, is a wellstudied method for enhancing strontium removal.In this study, the susceptibility of various (a)biotically-derived uranium and strontium (bio)remediation endpoints to oxidative dissolution was assessed using sediment microcosms. After the simultaneous removal of U and Sr using a range of biotic and abiotic treatment methods, namely organic electron donors and functionalised nanoparticles respectively, separate reoxidation batch microcosm experiments were set up to investigate how recalcitrant these phases were to oxidising conditions, induced either aerobically or through the addition of nitrate. Of the 6 experimental microcosms, 3 treatment methods resulted in the enhanced cotreatment of U and Sr, compared with a control microcosm not amended with any treatment. The compounds that enhanced uranium and strontium removal were Carbo-iron, Nanofer25S and glycerol phosphate. Glycerol phosphate additions concurrently precipitated amorphous U(IV)-phosphate and strontium-incorporated calcium phosphate biominerals. The strontiumphosphate biominerals proved highly recalcitrant to oxidative dissolution, with the (a)biotically induced oxidising conditions further enhanced strontium removal as opposed to releasing strontium back into solution. The microcosms amended with Carbo-iron produced a carbon and iron-associated U(IV) species, by far the least susceptible to remobilisation under aerobic conditions, and also one of the most recalcitrant to nitrate-induced oxidation (along with glycerol phosphate and Nanofer25S treatments). Transferring the end-product of glycerol phosphate treatment (U(IV)-phosphate) to aerobic conditions resulted in a steady increase in dissolved uranium concentration, although the endpoint was highly resistant to nitrate-induced oxidation. Lastly, the potential of urea to stimulate bacterial ureolysis in an indigenous microbial community was examined, again using Sellafield-sediment microcosms. It was hypothesised that the ureolytic activity would generate sufficient alkalinity, favouring calcium carbonate precipitation, capable of coprecipitating aqueous Sr2+ions. However, attempts to induce strontium-incorporated calcium carbona.
590 $a School code: 1543.
650 4 $a Nitrates. $3 914879
650 4 $a Bioremediation. $3 677632
650 4 $a Minerals. $3 542841
650 4 $a Biogeochemistry. $3 545717
650 4 $a Bacteria. $3 550366
650 4 $a Environmental impact. $3 3564810
650 4 $a Mining. $3 3544442
650 4 $a Radiation. $3 673904
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Nuclear energy. $3 539127
650 4 $a Nuclear reactors. $3 673875
650 4 $a Electricity. $3 524507
650 4 $a Oxidation. $3 714629
650 4 $a Groundwater. $3 566494
650 4 $a Carbon. $3 604057
650 4 $a Cosmic rays. $3 836138
650 4 $a Astronomy. $3 517668
650 4 $a Energy. $3 876794
650 4 $a Hydrologic sciences. $3 3168407
650 4 $a Mineralogy. $3 516743
650 4 $a Nuclear engineering. $3 595435
650 4 $a Nuclear physics. $3 517741
650 4 $a Physics. $3 516296
650 4 $a Water resources management. $3 794747
690 $a 0551
690 $a 0404
690 $a 0425
690 $a 0606
690 $a 0791
690 $a 0474
690 $a 0388
690 $a 0411
690 $a 0552
690 $a 0756
690 $a 0605
690 $a 0595
710 2 $a The University of Manchester (United Kingdom). $3 3422292
773 0 $t Masters Abstracts International $g 85-09.
790 $a 1543
791 $a M.Phil.
792 $a 2024
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30846361